Remove VideoCaptureDeviceFactory::EnumerateDeviceDescriptors()

media/capture/video/video_capture_system_impl.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_SYSTEM_IMPL_H_
 #define MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_SYSTEM_IMPL_H_
 
 #include "media/capture/video/video_capture_system.h"
 
 namespace media {
 
 // Layer on top of VideoCaptureDeviceFactory that translates device descriptors
 // to string identifiers and consolidates and caches device descriptors and
 // supported formats into VideoCaptureDeviceInfos.
 class CAPTURE_EXPORT VideoCaptureSystemImpl : public VideoCaptureSystem {
  public:
   explicit VideoCaptureSystemImpl(
       std::unique_ptr<VideoCaptureDeviceFactory> factory);
   ~VideoCaptureSystemImpl() override;
 
   void GetDeviceInfosAsync(const DeviceInfoCallback& result_callback) override;
   std::unique_ptr<VideoCaptureDevice> CreateDevice(
       const std::string& device_id) override;
 
  private:
-  void OnDescriptorsReceived(
-      const DeviceInfoCallback& result_callback,
-      std::unique_ptr<VideoCaptureDeviceDescriptors> descriptors);
-
   // Returns nullptr if no descriptor found.
   const VideoCaptureDeviceInfo* LookupDeviceInfoFromId(
       const std::string& device_id);
 
   const std::unique_ptr<VideoCaptureDeviceFactory> factory_;
   std::vector<VideoCaptureDeviceInfo> devices_info_cache_;
 
   base::ThreadChecker thread_checker_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_SYSTEM_IMPL_H_